A125667 - cp's OEIS frontend

A125667 Eta numbers (from the Japanese word for "pariah" or "outcast"). These are the positive odd integers which cannot be used to make a hypotenuse of a primitive Pythagorean triangle (PPT).

n	a(n)
1	1
2	3
3	7
4	9
5	11
6	15
7	19
8	21
9	23
10	27
11	31
12	33
13	35
14	39
15	43
16	45
17	47
18	49
19	51
20	55
21	57
22	59
23	63
24	67
25	69
26	71
27	75
28	77
29	79
30	81
31	83
32	87
33	91
34	93
35	95
36	99
37	103
38	105
39	107
40	111
41	115
42	117
43	119
44	121
45	123
46	127
47	129
48	131
49	133
50	135
51	139
52	141
53	143
54	147
55	151
56	153
57	155
58	159
59	161
60	163
61	165

[1, 3, 7, 9, 11, 15, 19, 21, 23, 27, 31, 33, 35, 39, 43, 45, 47, 49, 51, 55, 57, 59, 63, 67, 69, 71, 75, 77, 79, 81, 83, 87, 91, 93, 95, 99, 103, 105, 107, 111, 115, 117, 119, 121, 123, 127, 129, 131, 133, 135, 139, 141, 143, 147, 151, 153, 155, 159, 161, 163, 165]

cp's OEIS Frontend

A125667 Eta numbers (from the Japanese word for "pariah" or "outcast"). These are the positive odd integers which cannot be used to make a hypotenuse of a primitive Pythagorean triangle (PPT).

Table of values

List of values

n	a(n)
1	1
2	3
3	7
4	9
5	11
6	15
7	19
8	21
9	23
10	27
11	31
12	33
13	35
14	39
15	43
16	45
17	47
18	49
19	51
20	55
21	57
22	59
23	63
24	67
25	69
26	71
27	75
28	77
29	79
30	81
31	83
32	87
33	91
34	93
35	95
36	99
37	103
38	105
39	107
40	111
41	115
42	117
43	119
44	121
45	123
46	127
47	129
48	131
49	133
50	135
51	139
52	141
53	143
54	147
55	151
56	153
57	155
58	159
59	161
60	163
61	165

n	a(n)
1	1
2	3
3	7
4	9
5	11
6	15
7	19
8	21
9	23
10	27
11	31
12	33
13	35
14	39
15	43
16	45
17	47
18	49
19	51
20	55
21	57
22	59
23	63
24	67
25	69
26	71
27	75
28	77
29	79
30	81
31	83
32	87
33	91
34	93
35	95
36	99
37	103
38	105
39	107
40	111
41	115
42	117
43	119
44	121
45	123
46	127
47	129
48	131
49	133
50	135
51	139
52	141
53	143
54	147
55	151
56	153
57	155
58	159
59	161
60	163
61	165

n	a(n)
1	1
2	3
3	7
4	9
5	11
6	15
7	19
8	21
9	23
10	27
11	31
12	33
13	35
14	39
15	43
16	45
17	47
18	49
19	51
20	55
21	57
22	59
23	63
24	67
25	69
26	71
27	75
28	77
29	79
30	81
31	83
32	87
33	91
34	93
35	95
36	99
37	103
38	105
39	107
40	111
41	115
42	117
43	119
44	121
45	123
46	127
47	129
48	131
49	133
50	135
51	139
52	141
53	143
54	147
55	151
56	153
57	155
58	159
59	161
60	163
61	165